From b6627f53bf459334446bb1e2c51728a764c8651d Mon Sep 17 00:00:00 2001 From: johannst Date: Fri, 14 Mar 2025 01:19:37 +0000 Subject: deploy: cb9e06f3a5bd9d42494e6abdaf61fb3fe19d4ea4 --- print.html | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 101 insertions(+), 9 deletions(-) (limited to 'print.html') diff --git a/print.html b/print.html index b3b3e20..28df4d6 100644 --- a/print.html +++ b/print.html @@ -25,9 +25,9 @@ - - - + + + @@ -2828,6 +2828,7 @@ renice -n 5 -p PID
  • OProfile
  • callgrind
  • valgrind
    • +
  • vtune

    • /usr/bin/time(1)

    # statistics of process run
@@ -3222,6 +3223,59 @@ int main() {
     --gen-suppressions=yes      Generate suppressions file from the run.
     --suppressions=FILE         Load suppressions file.
    +

    vtune(1)

    +

    Vtune offers different analysis. Run vtune -collect help to list the +availale analysis.

    +

    Profiling

    +

    The following shows some common flows with the hotspot analsysis +as an example.

    +
    # Launch and profile process.
+vtune -collect hotspots [opts] -- target [args]
+
+# Attach and profile running process.
+vtune -collect hotspots [opts] -target-pid <pid>
+
    +

    Some common options are the following.

    +
    -r <dir>           output directory for the profile
+-no-follow-child   dont attach to to child processes (default is to follow)
+-start-paused      start with paused profiling
+
    +

    Analyze

    +
    vtune-gui <dir>
+
    +

    Programmatically control sampling

    +

    Vtune offers an API to resume and pause the profile collection from within +the profilee itself. This can be helpful if either only a certain phase should +be profiled or some phase should be skipped.

    +

    The following gives an example where only one phase in the program is profiled. +The program makes calls to the vtune API to resume and pause the collection, +while vtune is invoked with -start-paused to pause profiling initially.

    +
    #include <ittnotify.h>
+
+void init();
+void compute();
+void shutdown();
+
+int main() {
+  init();
+
+  __itt_resume();
+  compute();
+  __itt_pause();
+
+  shutdown();
+  return 0;
+}
+
    +

    The makefile gives an example how to build and profile the application.

    +
    VTUNE ?= /opt/intel/oneapi/vtune/latest
+
+main: main.c
+	gcc -o $@ $^ -I$(VTUNE)/include -L$(VTUNE)/lib64 -littnotify
+
+vtune: main
+	$(VTUNE)/bin64/vtune -collect hotspots -start-paused -- ./main
+

    Debug